Almost everywhere, we can recognize that it is possible to find the 802.11 Access Points (APs), thus enjoying Internet services thanks to fast and widely spreading 802.11 Wireless Local Area Networks (WLANs). Besides, WLANs are expected to deliver almost 53 percent of world-wide Internet traffic in the year of 2019.Accordingly, we face an urgent demand to improve the network throughput of WLAN so that extensive studies on the issues have been carried out in academic areas as well as standard areas in IEEE 802.11ac/ad/ah.This dissertation propose to aggressively utilize the spaces near by the stations transmitting frames even when those spaces are sensed busy for aggregation network throughput enhancement rather than network throughput improvement that can be achieved through frame aggregation. Surprisingly, it is studied since a station detecting busy channel can send a frame to another station sensing its channel idle. For this purpose, we dig into previous studies for spatial reuse to improve network throughput.During the investigation, we find there are so many limitations with studies. For example, they are impractical and too difficult to implement because they even want to control the transmit power of device with device driver sophisticatedly. Especially, they cannot handle the dynamic topology change, wireless channel and so on.This dissertation suggest an aggressive spatial reuse scheme based on an idea-the more attempt of transmit increase, the more network throughput enhance. Aggressive spatial reuse with no power control, no tuning carrier sensing threshold, no rate adaptation and so on is consisting of disruptive RTS (dRTS), busy random backoff, zero padding, and unavailable pair management. With disruptive RTS, we can evaluate ongoing data transmission could be affected with other attempts. If disruptive RTS doesn’t corrupt ongoing data transmission, a node can transmit spatial reuse data with busy random backoff, especially can operate with busy channel environment. Zero padding for spatial reuse data protects spatial reuse ACK control frame from ongoing data transmission. And a node should be deleted if it could not utilize the aggressive spatial reuse scheme with unavailable nodes management.With ns-2 network simulator, we show that the proposed scheme can improve the aggregate network throughput from 14% on random topology with variable distance between nodes to 50% with 2-D grid topology with fixed distance while the station adopting the proposed scheme coexists with the legacy stations with various environments.In this dissertation, we can know that our scheme can provide aggregation network throughput enhancement while satisfying backward compatibility on legacy IEEE 802.11 and strengthen that IEEE 802.11 Wireless LAN can play an important role on future IoT (Internet of Thing) worldFor the further study, we will also more evaluate our scheme on mobile environment, develop this aggressive spatial reuse strategy with using IEEE 802.11 wireless system and confirm aggregation network throughput enhancement of our strategy with various topologies on real environment.